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This study was carried out to evaluate the productivity, utilization and sward structure of a mixed massaigrass (Panicum maximum x P. infestum, cv. Massai) and forage peanut (Arachis pintoi Ac 01) pasture, intermittently stocked at three daily herbage allowance levels (9.0, 14.5 and 18.4% of live weight). In each grazing cycle, dry matter (DM) accumulation rates, defoliation intensity (%), grazing depth (%) and grazed horizon (cm) were evaluated. The structure of massaigrass tussocks was characterized in both dry and rainy seasons by measuring its pre-grazing morphological composition and post-grazing height and density (tussocks/m). Pastures submitted to higher herbage allowance (HA) levels showed higher productivity, but were less efficiently utilized. On average, over the experimental period, DM accumulation rates increased linearly from 56.8 to 81.3 kg/ha/day as HA levels increased from 9.0 to 18.4% of live weight. However, defoliation intensity and grazing depth declined linearly with increasing HA levels. During the dry season, pre-grazing morphological composition of massaigrass was characterized by 41% of green leaf blades, 10% of pseudostems and 49% of dead material, irrespective of HA levels. In the rainy season, however, it showed higher percentage of green leaf blades and lower percentage of pseudostems when submitted to lower HA levels, although there were not differences in relation to percentage of dead material. The structure of massaigrass tussocks tended to deteriorate at high HA levels. Este estudo foi realizado para avaliar a produtividade, utilização e estrutura de uma pastagem consorciada de capim-massai (Panicum maximum x P. infestum, cv. Massai) e amendoim forrageiro (Arachis pintoi Ac 01), submetida a três níveis de oferta diária de forragem (9,0; 14,5 e 18,4% do PV), sob lotação rotacionada. A cada ciclo de pastejo, avaliou-se a taxa de acúmulo de matéria seca (MS), a intensidade de desfolha (%), a profundidade de pastejo (%) e o horizonte pastejado (cm). A estrutura das touceiras do capim-massai foi caracterizada nos períodos seco e chuvoso quanto à composição morfológica pré-pastejo e à altura e densidade (touceiras/m) pós-pastejo. Pastagens submetidas a maiores níveis de oferta de forragem (OF) apresentaram maior produtividade, porém foram utilizadas com menor eficiência. Na média do período experimental, a taxa de acúmulo de MS da pastagem aumentou linearmente de 56,8 para 81,3 kg/ha/dia com o aumento dos níveis de OF de 9,0 para 18,4% do PV. A intensidade de desfolha e a profundidade de pastejo, no entanto, reduziram linearmente com o aumento dos níveis de OF. No período seco, a composição morfológica do capim-massai se caracterizou por apresentar 41% de lâminas foliares verdes, 10% de pseudocolmo e 49% de material morto, independentemente dos níveis de OF. No período chuvoso, o capim-massai apresentou maior porcentagem de lâminas foliares verdes e menor de pseudocolmo nas pastagens submetidas a menores níveis de OF, não diferindo quanto à porcentagem de material morto. Houve, portanto, tendência de deterioração da estrutura das touceiras do capim-massai com o uso de maiores níveis de OF

Grazing management strategies for massaigrass-forage peanut pastures: 2. productivity, utilization and sward structure